Tool for planing valve seats



April 24, 1928.

ATTORNEYS Theodore 5Z'Purm'5,

Patented Apr. 24, 1928.

SON COMPANY,XOF ABERDEEN; SOUTH DAKOTA, A. CORPORATION OF SOUTH DA- KOTA. V y

Applieationefileddluly 1, 1926.,

This invention relates to a-device torplan ing valve seats of internal combustion engines.

An object of theinventionis the provision of a device which is adapted to accommodate be used, and adapted to act as a guide and limit the depth of the cut when it becomes seated in an opening inthe cylinderblock which at the outer end of an intake or V exhaust passage, cutterr head. being so constructed asto receive. andhold a plurality of ocut-ting blades for performing varis.

ous operations to reduce the width iof the old valve? seat andireplane the seat to a 0011- dition Where it will properlyseat the valve; This invention: will be hei understood from a consideration of the following de-.

tailed description, in viewof the accompanye ing drawings forming apart of the specification {nevertheless it isfto be understood that theinvention is notconfined to tl edis closure, being susceptible to such changes and modifications which shall"definenomaterial departure from the salient features of the invention as expressed the appended claim.

In the drawings:

Figure lis a view in elevation of the planer constructed 1n accordance with the principles of my invention and equipped with a cutting blade for planing the outer edge of the seat.

Figure-2 is a view in elevation of the device equipped with a cutting blade for planing the inner edge of the seat.

Figure3 is a fragmentary sectional view showing the method of locking the cutting blades in the cutter head.

Figure 4 is a horizontal section of the planing device.

Figure 5 is a fragmentary vertical section showing the valve seat after the same has been completely planed.

v c y 1,667,218 UNITEDFSTATTEVSZ :PATEN TIQFFICE.

rnnononn s. PURNIS, or ABERDEEN; SOUTH DAKOTA, assumes no THE KLO. LEE &

- TOOL FOR PLANING VALVE S EATS." 1

Serial No..l19,909.

Referring. more particularly to the drawings,-1O designates a cyllnder block having airexhaust or intake passageshown at 11.

When the valve seat becomes so badly Worn that it is enlarged inarea it is necessary therefore tojpljane on. opposite sides of the seat lll'OlKlQl' llO. reduce the width of the seat so that the valve may (properly be positioned and snugly engage all parts otthe seat. In order to accomplishthis result I have provided a. conically. shaped cutter head 12..

This cutter head has a verticalslot 13 adapts ed to receive a blade or cutter 14L" which has a. cutting edge 15 1 adaptedto remove agpo'rtion lfifroin' the outer edge of the seat 17 in the first step intheprocess for reducing the width of the. seat;

Adjacent the slot 13 is aslightly passage 18 adaptedto receive a pin'191which has a fiat face 20 engaging the cutter blade 14 when the pin-is driveninto thepassage whereby, after the blade vhas been properly adjusted, the wedging action of thepin will maintain the blade againstdisplacement. j A second slot 21 isiormed vertically and radially of thehead andis likewise provided;

with slightly tilted passage 22 opening into'theslot 21 andadaptedto receiveapin 23. forwedging a, blade 24- in the slot 21" against movement when thehead 12 is r'otatedf Thesideor cutting edge 25 of the blade 24 is inclined at an angle to the vet-ti I cal andproducesa cut; asshown at 26in Figure 5 for aiding n reducing the wldth of the seat 17; Thisv cut, as is shown,isniade at the inn'er edgejof said] seat.

I Both of'the bIadesM and 24 h ave t-heir rear edges in snug engagement with the rear vertical Wall 27 of either of the slots .13 or 21 as the case maybe and this aids in cooperation with the pins for maintaining the adjustment of the blades.

' thereinbut this is not shown in the drawings.

The cutter headis held in position by means ot a centering pin '28 which has an enlargement, as shownat 29, adapted to be engaged by someisuitable tool for turning the same whereby the threads 5500f the upper end of the pin is screwed into thethreaded opening .inthe center of the cutter head. The pin 28 is adapted to be received within a passage 31 in which the usual valve stem of the engine is adapted to be reciprocated. This pin aids in maintaining the cutter head centered over the Valve seat.

A shank 32 is screwed or secured in any approved manner in the upper portion of the head and rises centrally therefrom. The extreme upper end is provided with a polygonally faced portion 33 adapted to be engaged by a suitable tool for turning the same if desired, otherwise a bar maybe inserted through a passage 34 in the upper end of the shank whereby the same may be turned.

It will be noted by my improved tool that all of the cutter blades for performing different parts of the operation may, be used at the same time, or, only one cutter blade. may be used at a time, but, in the practical performance for the operation it will be found that blades 14 and 24- for planing at the inner and outer edges of the old valve seat may be used at the same time and readily operated by hand, while the tool for replaning the valve seat to the pitch of the valve to be seated therein can be more satisfactor ily used in a separate operation. Due to particular reception of the pin 28 in the passage 31, the cutter will be maintained properly positioned at all times during the operation of the device, while the conical faced portion 35 of the cutter head, being at a different pitch from the cutting edges of any of the cutter blades, will limit the depth of the cut when it becomes seated in the opening in the exhaust or intake passage.

The cutter bladesto be inserted in the vertically and radially disposed slots in the cutter head are tapered from their inner thicker edge to the outer thinner edge so that when the pins are forced into the respective slanting holes opening into said vertical passages, the pins will tend to force the blades inwardly against the inner wall of the passage and prevent displacement of the blades. An important feature of the tool is that the conical portion 35 serves, not only as a recepta-' cle for the cutting blades, 14 211x124, but

also as a guide and gauge to determine the diameter of the upper outside edge and also of the lower inner edge of the valve seat 17 as indicated in Figure 5,

Referring to Figure 1 it will be seen that when downward pressure is applied and the tool rotated, cutting edge 15 continues cutting at '16 until the conical portion 35 rests on the valve seat surface 17. When the conical portion 25 rests entirely on the surface of the valve seat 17, the cutter blade ceases to cut, hence, it is obvious that the same operation repeated'on the other valve seats with no change orreadjustment of the cutter blade 14 will insure identically the same diameter of the upper outer edge of the valve seat 17. This result-can be obtained only when the conical portion 35 has a differ ent angle than the cutter blade 14, serving as a gauge for same.

What I claim is: e

A device of the character described for planing the passage in a cylinder block having a valve seat in the outer end of the pas sage and comprising a cutter head having a cylindrical upper portion and a comically shaped lower portion, saidconically shaped head being provided with vertical slots disposed 'radially, each slot, opening through the outer wall of the head with the inner wall of the slot beingflocated adjacent the center, a cutter blade mounted in each radial slot, said head bein'g'provided with a passage slanting into each vertical slot at one side thereof, a pin forced into each slanting passage and providedwith an incli ned face engaging a cutter blade for forcingthe cutter into engagement with the rear wall of the vertical slot, means for rotating the cutter head, one of the cutter blades being 5 THEODORE s'PURNIsQ 

